<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        ul {
            width: 192px;
            list-style: none;
            padding: 0;
            margin: 0 auto;
            height: 64px;
        }

        ul li {
            float: left;
            margin: 0 5px;
            border: 2px solid transparent;
        }

        ul li:hover {
            border: 2px solid #f30213;
        }
    </style>
</head>

<body>
    <ul>
        <li><img src="./images/ku1.jpg" alt=""></li>
        <li><img src="./images/ku2.jpg" alt=""></li>
        <li><img src="./images/ku3.jpg" alt=""></li>
    </ul>
</body>

</html>